封面说明：云南曲靖下泥盆统西屯组先驱杨氏鱼是一种原始的肺鱼形类肉鳍鱼类。它化石数量较多，脑颅、齿列等精细结构保存好，是进行连续磨片研究的绝佳对象。张弥曼对杨氏鱼的比较解剖学工作为研究肉鳍鱼类分化和登陆过程做出了杰出的贡献。封面图展示了杨氏鱼脑颅蜡质模型(左)、脑颅连续磨片素描(中)及依据近年来发现的完整化石标本的三维生活复原(右)。(连续磨片及蜡制模型制作人：张弥曼；生活复原制作：中国科学院古脊椎动物与古人类研究所拟石古生物可视化实验室)
Cover image: Youngolepis praecursor from the Xitun Formation (Lower Devonian) of Qujing, Yunnan, is a primitive dipnomorph lobe-finned fish. It is known from abundant fossils with exquisite preservation of delicate structures such as the braincase and dentition, perfect for studying with serial grinding technique. Chang Meemann’s work on the anatomy of Youngolepis, using serial grinding technique, has made outstanding contributions for our understanding of the diversification of sarcopterygians, and the fish-tetrapod transition. The cover image shows (from left to right): a wax model of the braincase of Youngolepis; drawings of serial grinding sections through the braincase; and a 3D life reconstruction of Youngolepis based on near-complete fossil specimens discovered in recent years. (Serial grinding sections and wax model by Chang Meemann; life reconstruction by NICE Paleovislab, IVPP)
